Electrical relay.



E. E. CLEMENT.

ELECTRICAL RELAY. APPLICATION FILED we. 22, 1906.

928,360. C Patented July 20,1909.

0: (I; 6ND flaw-Jaw! 1:;- as m mm Wm UNITED STATES PATENT carton.

EDWARD E. CLEMENT, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR- TO THE NORTH ELECTRIC COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

IELEC'IRIGAL RELAY.

Specification of Letters Patent.

Patented July 20, 1909.

Application filed August 22, 1906. Serial No. 331,564.

My invention relates to electrical relays,

and has for its object the provision of a relay suitable for use in certain types of telephone exchange systems as wcllas in other systems, requiring a multiplicity of contacts to be made and broken.

Heretofore it has been diflicult to design a relay which would make and break more than one or two pairs of contacts .satisfaetorily, and so far as'I know it has never been possibleto have an ordinary relay, working in the ordinary way as such, directly control a considerable number of circuits. The principal reason for this has lain in the (lifiieulty of adjusting many contacts so that one movement of a common part would make or break them all satisfactorily. Some might make and others not, and vice versa.

According to the present invention I make all the contacts self-adjusting, so that the armature which is common to and operates them all need not be adjusted to them, butthey adjust themselves individually to it as well as to each other.

Certain advantages will appear in details of construction, as I proceed with my description, and in the claims appended thereto. 7

My invention is illustrated in the accompanying drawings in which:

Figure l'is a longitudinal sectional view with the casing in place. Fig. 2 is a top plan view with the case removed, and Fig. 3 is a rear view showing the back plate in position.

Referring to the figures, A is an electromagnet comprising a pair of spools a (only one of which is shown), whose cores a are secured to the rear yoke piece a of brass or other non-magnetic material, in any suitable manner. This rear yoke a? has a longitudinally extending portion or flange a which lies over the top of the magnet wiudings and reaches a point approximately [lush with the projecting ends of the cores a. This projecting portion orflange of is partly cut away at a so as to lighten the structure,

is of somewhat larger areathan the backplate so as to form a flange against which the edge of the inclosing shell or cover C can rest. This shell inclosestne entire structure in a dust and moisture-poof ch. nber and is preferably formed or drawn up out of sheet metal continuous except for the pen mouth, and is slid over the relay from the outer end until its edges engage the back plate B. A threadedrod it extends between the windings of the electromagnet A and is secured in any suitable manner to the rear yoke pieces a and to the back plate 0, and nut a engages the threaded forward end of the rod and is adapted to hold the casing in position:

Mounted to rock upon the flange w is'an angular armature M which is provided with two perforations through which threaded lugs are adapted to pass to receive nuts m which hold the armature in operative position. One leg or portion m of the armature M extends rearwardly over the flange a and the other leg or member 722/ depends at right angles thereto-so as to be located in proper relation to the projecting cores a Each of springs S, mounted upon the "rear of the flange a comprises the individual members 8, a, s s, which are separated by strips of insulating material 8 s, s, s, and 8*. All of the sets are separately secured to the flange a by means of the screws 8 whose heads rest upon the metal strips 5". In the use to which I apply this relay at. present, that of cutting on a metallic circuit to its extensions, it is requisite to have two pairs of contacts, one pair for each side of the metallic circuit in each set. Both of these are made and broken at once, and there may be as many sets as there are circuits to be controlled. In each set the springs 8 and .s" are the movable or work ing springs and the springs s, a are the fixed or anvil springs; As shown in Fig. 1, I make all these springs self adjusting by a very simple expedient. that is, by the use of two little studs r, s, one for each pair. The stud s" rests with its base upon the forward end of the. leg m of the ..r.nature its reduced portion or stem extendihg through a hole in the spring 8 and supporting the spring a. The bases of all the studs 8 rest upon the flange m thereof and thus hold it against the return flange a of the rear yoke piece a. At a point near the rear of the leg m rest the bases of the oper ating studs 8. andits stem or reduced portion passes up through holes in the springs 8 s and rests upon the underside of the spring 8 so as to support it. The springs s and 8 rest therefore upon the shoulder and the top respectively of thestuds .9, and when the armature is-t ilted by having its leg or flange m drawn ,to the poles of the magnet, all

the studs 8 are lifted, lilting up the springs s and 8. By noting the shape and arrangement of the studs, it will be observed that each set of springs is self-adjusting, all the springs having a downward set or tendency toward the windings of the magnet. All the sets of springs have their contact points visible and accessible from the front of the relay so as to permit inspection and repairs. 1

It is not absolutely necessary to use a pair of electromagnets in the manner de scribed as a single spool might do the work. I prefer the pair of windings however, as the operation ismuch more certain and the vmagnetic circuit is shorter.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. An electrical relay comprising a pair of electromagnets having their cores magnetically unitedat their rear end, a yoke piece carried by the rear end of the core, armature supporting means carried by said yoke piece, an angular armature having a depending portion extending in front of and across the ends of the cores and a substantially horizontal portion extending over the tops of the magnet spools, and a plurality of sets of contact springs, each comprising a plurality of pairs, upon said yoke piece and extending forward with the ends of the corresponding anvil springs in each set supported at one point, and those of the movable springs at another point on. the horizontal portion of the armatum, the point 0f support of the anvil springs being that of minimum motion.

QJAn'electncal .r 01' electromagnets comprising a pair their cores magnetlcally united at ineir r end, a roar yoke piece earned by the rear end of the cores, armature supporting means integral Each stud is shoulderedeaaeeo with said yoke piece and extending forward over the windings of the electromagnets, a bent armature having a depending portion extending in front of and across the ends oi the cores and provided with a substantially horizontal portion extending from the tops of the magnet spools, and a plurality of sets of contact springs each comprising a plurality of pairs secured upon said yoke piece and extending forward with their bodies overlying the horizontal portion of the armature, the bodies of the movable springs in each set resting upon the inner extremity of the armature, and the ends of the anvil springs being supported thereon at the point 1 of least motion.

3: An electrical relay structure comprising the following instrumentalities: a pair of cores carrying windings, a magnetic yoke plate across the rear ends of the said cores, a yoke piece of non-magnetic material also across the rear end of said cores; non-mag netic armature supporting means integral with said yoke piece, a broad angular armaturc pivoted upon the end of said supporting means so as to have a depending portion extending across and in frontof both cores and a horizontal operating portion extending completely across the top of the magnet windings, a plurality or sets of contact springs having movable and anvil members in each set, individual means carried by the armature for maintaining the relative adjustment in each set and for maintaining individual engagement oi the working members and the armature, and means to retain the armature from displacement.

4. An electrical relay comprising the following instrumentaliticsz' a pair of cores carrying windings, a magnetic connection between said cores, a rear yoke piece of non" magnetic material connecting said cores and abuttingthe magnetic connection, a nonmagnetic return portion or flange carried by said yoke piece, extending over the tops of the windings to a point approximately flush with the forward end of the cores, a broad angular armature bent so as to have a depending portion extending across and in front of both corcs'and provided with a and the armature. the sets of sprii cxlend: forward beyond the opera and ad} ding ans so as to have their contact points unobstructed and visible fro; the iron of' the relay, and means for retaining the armature aganist displacement.

lOti

' non-magnetic yoke piece connecting said 5. An electrical relay comprising a air of parallel cores united at their rear en s by, a magnetic plate, windings upon said cores, a

cores and having a return portion extending over the cores to the forward end thereof, an armature supported upon said return portion and extending across the front ends of said cores, operating members connected to said armature, a plurality of sets of contact springs secured upon the return portion of said yoke piece, and extending forward parallel therewith into position to be enaged and actuated by said operating memers, and means for holding the armature against displacement.

6. An electrical relay comprising an elec-i tromagnet, a non-magnetic rear yoke piece, an extension integral with said yoke plece,

EDWARD E. CL IWENT.

Witnesses:

E. EDMONSTON, J12, H. B. CAMPBELL. 

